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Finding the Fourth Proportional to 1,071.87, 1,608.03 and 378.56

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Solution

The fourth proportional to 1,071.87, 1,608.03 and 378.56 is: 567.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.87 : 1,608.03 = 378.56 : x
  2. Step 2: Convert to fraction form
    1,071.87/1,608.03 = 378.56/x
  3. Step 3: Cross multiply
    1,071.87x = 1,608.03 × 378.56
  4. Step 4: Simplify right side
    1,071.87x = 608,727.80
  5. Step 5: Solve for x
    x = 608,727.80/1,071.87
  6. Step 6: Final answer
    x = 567.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.